Patents by Inventor Aluizio Prata, Junior

Aluizio Prata, Junior has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Directional coupler for separation of signals in two frequency bands while preserving their polarization characteristics
    Patent number: 4777457
    Abstract: A directional coupler is provided which has an appropriately dimensioned principle waveguide with a frequency dependent reactive boundary interior surface such that the principle waveguide is suitable to simultaneously: (i) support, without depolarization, effective propagation of first signals in a high frequency band at a HE11 mode with greater concentration of energy near the axis of the principle waveguide than near the interior surface and no effective propagation of first signals at any unwanted mode, and (ii) support, without depolarization, effective propagation of second signals in a lower frequency band at a EH11 mode having a greater concentration of energy near the interior surface of the principle waveguide than near the axis and no effective propagation of second signals at any unwanted mode.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: October 11, 1988
    Assignee: Telecomunicacoes Brasileiras S/A - Telebras
    Inventors: Subir Ghosh, Aluizio Prata, Junior